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Titolo:
Effect of the type of activated carbons on the photocatalytic degradation of aqueous organic pollutants by UV-irradiated titania
Autore:
Matos, J; Laine, J; Herrmann, JM;
Indirizzi:
Ecole Cent Lyon, Lab Photocatalyse Catalyse & Environm, IFoS, CNRS,UMR, F-69131 Ecully, France Ecole Cent Lyon Ecully France F-69131 , CNRS,UMR, F-69131 Ecully, France Inst Venezolano Invest Cient, Ctr Quim, Lab Fisicoquim Superficies, Caracas 1020A, Venezuela Inst Venezolano Invest Cient Caracas Venezuela 1020A as 1020A, Venezuela
Titolo Testata:
JOURNAL OF CATALYSIS
fascicolo: 1, volume: 200, anno: 2001,
pagine: 10 - 20
SICI:
0021-9517(20010515)200:1<10:EOTTOA>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYDRODESULFURIZATION CATALYSTS; COCONUT SHELL; NI-MO; ADSORPTION; SUPPORT; PHENOL; DICHLOROMETHANE; PROPYZAMIDE; REMOVAL; WATER;
Keywords:
photocatalysis; helio-photocatalysis; titania; organic; pollutants degradation; activated carbon; phenol; 4-chlorophenol; 2,4-D; associative effect;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Herrmann, JM Ecole Cent Lyon, Lab Photocatalyse Catalyse & Environm, IFoS,CNRS,UMR, BP163, F-69131 Ecully, France Ecole Cent Lyon BP 163 Ecully France F-69131 Ecully, France
Citazione:
J. Matos et al., "Effect of the type of activated carbons on the photocatalytic degradation of aqueous organic pollutants by UV-irradiated titania", J CATALYSIS, 200(1), 2001, pp. 10-20

Abstract

The photocatalytic degradation of three model pollutants (phenol, 4-chlorophenol, and herbicide 2,4-D (2,4-dichlorophenoxyacetic acid) was performed at room temperature in aqueous suspended mixtures of TiO2 and of two different activated carbons (AC) of commercial origin. The kinetics of disappearance of the pollutants followed an apparent first-order rate, whose constantwas selected as the best parameter (independent of pollutant concentrations) to determine the influence of each AC on the photoactivity of titania. Remarkable different effects were observed in the kinetics of disappearance of the pollutants as well as in the kinetics of appearance and disappearance of the intermediate products detected. Each pollutant was more rapidly photodegraded in the mixed system which contained H-type activated carbon. Inthe case of phenol, a maximum synergy factor R equal to 2.5 was detected when the mass ratio (TiO2/AC(H-type)) corresponded to (50/10). An identical synergy factor (2.4) was found for 4-chlorophenol degradation, whereas a smaller one (R = 1.3) was found for 2,4-D because of its poor solubility. On the contrary, the L-type activated carbon inhibited titania's photoactivitywith R < 1. In addition, significant differences in intermediate product distributions were observed as a function of the type of AC. The synergy or inhibition effects and the formation of the different intermediate productsdetected have been correlated to the origins and the properties of the twoAC employed. When performing the "helio-photocatalytic" degradation of 4-chlorophenol with an extrapolation volume factor of 12,500 in a large-scale solar pilot plant, an identical synergy factor of 2.4 was found, thus confirming the transpositivity of laboratory experiments to large solar setups. The synergy effect was not destroyed when reusing the double-phase photocatalyst. This photocatalytic system, associating titania with H-type activated carbon, may appear as a new performing one, more efficient with a shortertime necessary for decontaminating diluted used waters. It could be of interest in producing detoxified and/or drinking water in dry sunny areas. (C)2001 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 17:32:08